diff --git a/Source/SocketIO/Util/SocketExtensions.swift b/Source/SocketIO/Util/SocketExtensions.swift
index 8545132..23170b7 100644
--- a/Source/SocketIO/Util/SocketExtensions.swift
+++ b/Source/SocketIO/Util/SocketExtensions.swift
@@ -38,7 +38,7 @@ extension Array {
 
 extension CharacterSet {
     static var allowedURLCharacterSet: CharacterSet {
-        return CharacterSet(charactersIn: "!*'();:@&=+$,/?%#[]\" {}^").inverted
+        return CharacterSet(charactersIn: "!*'();:@&=+$,/?%#[]\" {}^|").inverted
     }
 }